package com.lmaye.utils;

/**
 * 加密/解密
 *
 * @author 吥 悔
 * @QQ 379839355
 * @时间 2015年8月13日 下午9:41:42
 */

public class Encipher {
    /**
     * 加密
     *
     * @param strPasswd 密码
     * @return String
     */
    public static String encode(String strPasswd) {
        String strEncodePasswd;
        int n;
        char code;
        String des;
        String strKey;
        if ((strPasswd == null) || strPasswd.length() == 0) {
            strEncodePasswd = "";
            return strEncodePasswd;
        }
        strKey = EncipherConst.m_strKey1 + EncipherConst.m_strKey2
                + EncipherConst.m_strKey3 + EncipherConst.m_strKey4
                + EncipherConst.m_strKey5 + EncipherConst.m_strKey6;
        while (strPasswd.length() < 8) {
            strPasswd = strPasswd + (char) 1;
        }
        des = "";
        for (n = 0; n <= strPasswd.length() - 1; n++) {
            while (true) {
                code = (char) Math.rint(Math.random() * 100);
                while ((code > 0)
                        && (((code ^ strPasswd.charAt(n)) < 0) || ((code ^ strPasswd
                        .charAt(n)) > 90))) {
                    code = (char) ((int) code - 1);
                }
                char mid = 0;
                int flag;
                flag = code ^ strPasswd.charAt(n);
                if (flag > 93) {
                    mid = 0;
                } else {
                    mid = strKey.charAt(flag);
                }
                if ((code > 35) & (code < 122) & (code != 124) & (code != 39)
                        & (code != 44) & (mid != 124) & (mid != 39)
                        & (mid != 44)) {
                    break;
                }
                // 确保生成的字符是可见字符并且在SQL语句中有效
            }
            char temp = 0;
            temp = strKey.charAt(code ^ strPasswd.charAt(n));
            des = des + (char) code + temp;
        }
        strEncodePasswd = des;
        return strEncodePasswd;
    }

    /**
     * 解密
     *
     * @param varCode 密文
     * @return String
     */
    public static String decode(String varCode) {
        int n;
        String des;
        String strKey;
        if ((varCode == null) || (varCode.length() == 0)) {
            return "";
        }
        strKey = EncipherConst.m_strKey1 + EncipherConst.m_strKey2
                + EncipherConst.m_strKey3 + EncipherConst.m_strKey4
                + EncipherConst.m_strKey5 + EncipherConst.m_strKey6;
        if (varCode.length() % 2 == 1) {
            varCode = varCode + "?";
        }
        des = "";
        for (n = 0; n <= varCode.length() / 2 - 1; n++) {
            char b;
            b = varCode.charAt(n * 2);
            int a;
            a = (int) strKey.indexOf(varCode.charAt(n * 2 + 1));
            des = des + (char) ((int) b ^ a);
        }
        n = des.indexOf(1);
        if (n > 0) {
            return des.substring(0, n);
        } else {
            return des;
        }
    }

    static class EncipherConst {
        public final static String m_strKey1 = "zxcvbnm,./asdfg";
        public final static String m_strKey2 = "hjkl;'qwertyuiop";
        public final static String m_strKey3 = "[]\\1234567890-";
        public final static String m_strKey4 = "=` ZXCVBNM<>?:LKJ";
        public final static String m_strKey5 = "HGFDSAQWERTYUI";
        public final static String m_strKey6 = "OP{}|+_)(*&^%$#@!~";
    }
}
